Electric horn.



W. W. DEAN.

ELECTRIC HORN. APPLICATION FILED OCT. 15, 1913- RENEWED MAY 22,1916? 1,209,403. Patented Dec. 19,1916.

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ELECTRIC HORN. APPLICATION FILED OCT. 15. I913. RENEWED MAY 22.1916.

1,209,403. Patented Dec. 19,1916. I

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WILLIAM W. DEAN, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

BENJAMIN ELECTRIC MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A COR- PORATION OF ILLINOIS.

ELECTRIC HORN.

Specification of Letters Patent.

Patented Dec. 19, 1916.

Application filed October 15, 1913, Serial No. 795,348. Renewed May 22, 1916. Serial No. 99,215.

To all whom it may concern:

Be it known that I, WILLIAM W. DEAN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Electric Horns, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to improvements in electric signal horns or alarms and has for one of its objects the production of a horn or signal which is simple in construction, efficient in operation and cheap to manufacture.

For the purpose of disclosing my invention, I have illustrated in the accompanying drawings certain embodiments thereof.

In said drawingsFigure l is a sectional view through the center of one embodiment of my invention; Fig. 2 is a rear view of the structure illustrated in Fig. l, with the shell or casing removed; Fig. 3 is a sectional view of a modified form of horn embodying my invention; Fig. 4 is a rear elevation, with the casing removed, of the structure illustrated in Fig. 3 Fig. 5 is a sectional view through the center of still another form embodying my invention; Fig. 6 is a rear elevation, with the casing removed, of the structure illustrated in Fig. 5; and, Fig. 7 is a diagrammatic view illustrating the instrument applied to a motor driven vehicle.

The embodiment illustrated is provided with the usual horn or resonator 10, which terminates in a flaring open or bell mouth and is secured at its inner end to the front section 11 of a casing containing the working parts of the signal. This front section is preferably stamped from sheet metal and is provided with a' forwardly extending flange 12 around its circular central openinstrument. On this seat is placed a ring or gasket '16, which is preferably formed of cork composition or other suitable material and which is of large enough inside diameter to fit snugly in the flange 13 of the front section of the casing. A sound-producing diaphragm 17, which is preferably formed of thin sheet metal, rests upon this gasket and is of such a diameter as to leave a clearance between its periphery and the interior of the flange 13 to accommodate the edge of the back section 14. of the shell or casing. A second gasket or r-ing18 is placed on the opposite side of this diaphragm, and this second ring is of substantially the same diameter as the diaphragm. These gaskets prevent the entrance of moisture, dirt, etc., around the diaphragm and afiord a suitable clamping surface for the edge of the diaphragm to permit it to suitably vibrate.

The gaskets and the diaphragm are held in position by a clamping ring 19, which is formed of soft iron or some other suitable magnetic material and is secured in clamping position by suitable screws 20 which pass through apertures in the front section 11 of the casing and are threaded into the ring 19. This ring has integrally formed therewith a pair of pole pieces or cores 21 which project inwardly from the ring toward the center of the diaphragm. These pole pieces, as shown, are bent upwardly at the point 22 so that they will lie in a plane parallel with, but above, the plane of the clamping ring 19. Surrounding each of these pole pieces is an energizing winding 23, which consists of wire of the proper size and kind, wound in the proper form on fiber bushings or core pieces, whereby the two windings may he slipped over the pole pieces formed as above described. Two of the terminals of the magnet coils are connected together by'twisting or in any other desired manner, as at 24,

and one of the terminals of one of the magnets is connectedwith a binding screw plate 25 by the screw 26. This plate ismounted upon the clamping ring 19 and is secured in position by the screws 26 and 27, suitable insulating bushings 28 being provided for properly insulating the screws and the plate from the clamping ring. The plate 25 also carries upon a suitable projection thereon a binding screw, to which one of the leadingin conductors may be attached. The armature for the magnet formed by the pole pieces 21 and windings 23 overlaps that portion of the pole pieces which projects beyond the spools and comprises a soft iron plate 29 which at its rear end is riveted to a spring or reed 30 suitably clamped, by means of the screws 31, upon a shelf 32 on the clamping ring 19. The armature 29 carries a tapper 33 which, when the armature is rapidly vibrated by the magnet, rapidly strikes the diaphragm, causing the same to rapidly vibrate and emit the warning sound.

The circuit through the magnet is rapidly interrupted by means of a vibrating contact, preferably consisting of a platinum point on the spring arm 34 and a stationary contact 35 mounted upon the stationary arm 36. The spring arm 34 is secured by a screw 37 upon the end 38 of a plate 39 clamped upon the clamping ring 19 by suitable screws 40. This clamping plate is suitably insulated from the clamping ring 19 by suitable insulating bushings 41. The screw 37 also acts as a binding-post to which one terminal of the magnet 23 is connected. The arm 36 is secured in position upon the clamping ring 19 by suitable screws 42 which pass through the arm and into the clamping ring, and this arm is insulated from the clamping ring by insulating bushings 43. The arm 36 also carries a binding screw 44, to which one of the conductor wires is attached. The armature 29 carries on its upper side an insulaing button 45, which maintains the contacts 35 and the contact on the spring arm 34 closed. I The tendency of the spring arm, however, is to open these contacts, and when the armature 29 is attracted by its magnet, due to this tendency the contacts will be opened. However, as soon as the circuit is opened the armature is released from engagement with the pole pieces of the magnet and the spring 30 returns the armature to its normal position, which again closes the contacts, whereby the circuit of the magnet is rapidly interrupted, causing the magnet to rapidly vibrate its armature and the tapper 33 to rapidly strike the diaphragm.

In the modified structure illustrated in Figs. 3 and 4 the pole pieces 21, instead of being arranged side by side, as in the strucpieces, four pole pieces are formed. These pole pieces are formed by radially extending arms 48, which, like the pole pieces 21, are integrally formed with the clamping ring 19. Around these pole pieces coils 49, similar to the coils 23, are adapted to be placed and one of the terminals of one of the coils is connected by the conductor 50 with the.

binding-post 51 on the clamping plate 39, which clamping plate also carries a bindingpost 52, to which one of the conductor wires is connected. The terminal of one of the other coils is connected by a conductor 53 with the spring 34, which spring is supported on the clamping plate in the same manner as is illustrated with respect to the spring 34 in Figs. 3 and 4. Also, the supporting arm 36 is formed in a manner similar to the supporting arm 36 illustrated in Figs. 3 and 4.

The armature for the magnet, formed as above described, comprises a circular soft iron disk 54 having a pair of laterally projecting arms 55, to which are secured a pair of reeds or springs 57. The opposite ends of these reeds or springs are connected to arms 58 inwardly projecting from and integrally formed with the clamping ring 19.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

In an electric horn, the combination with a diaphragm of an electromagnet for operating said diaphragm comprislng a ring having a plurality of inwardly projecting pole pieces, energizing windings surrounding said pole pieces, make and break contacts for said magnet comprising an inwardly extending stationary arm carried by said ring and supporting a stationary contact, and an inwardly extending vibratory arm carrying a contact and supported by said ring.

In Witness whereof, I have hereunto subscribed my name in the presence of two witnesses.

WILLIAM w. DEAN.

Witnesses: I

W. PERRY HAHN,. ANNE SOLOMON. 

